Impeller for rotary blowers or pumps.



PATENTED AUG. 11, 1903.

No'. 736,089. H. A. WAINWRIGHT.

IMPELLER FOR ROTARY BLOWERS 0R PUMPS.

APP LIUATION FILED FEB. 10, 1903.

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rrnn STATES Patented August 11, 1903.

ATENT FFICE- IMPELLER FOR ROTARY BLOWERS OR PUMPS.

SPECIFICATION forming part of Letters Patent N 0. 7 36,039, dated August11, 1903.

Application filed February 10 lQOS. Serial No. l l2,'718. (N0 model.)

To all whom it 777/CLy concern:

Be it known that I, HARRY ARCHIBLE WAIN- WRIGHT, a citizen of the UnitedStates, residing at Chicago, in the oountyof Cook and State of Illinois,have invented certain new and useful Improvements in Impellers forRotary Blowers or Pumps, of which the following is a specification.

This invention relates to improvements in rotary pumps or blowers forall purposes for which such machines are usually applied, and hasspecial reference to the construction of the piston or impeller usedtherein.

The object of the invention is to lighten the weight of the impellerwithout decreasing its strength and to very materially lessen the costof production in the two important items of cost of material and oflabor and time required to shape the material into the finished article.

I accomplish the objects of the invention by the mechanism illustratedin the accompanying drawings, in which Figure 1 is a side elevation andpartial section of my invention embodied in a threelobed impeller; Fig.2, a transverse section on the line 2 2 of Fig. 1; Fig. 3, a perspectiveView of the shell of a three-lobed impeller detached from the frame andshaft; Fig. 4, a side elevation and partial section of a twolobedimpeller made in accordance with my invention, and Fig. 5 a transversesection of Fig. 4. on the line 5 5 of said Fig. 4.

Like characters of reference indicate like parts throughout the severalviews of the drawings.

7 represents the main or driving shaft of usual construction, and 8 theframe-heads, having an outside contour which conforms with the shape ofthe desired lobes of the impeller. They may be punched or cast and willpreferably have the hubs 9 and the openwork 10. As many of theseframe-heads will be used as are required to give a substantial supportto the shell 11 of the impeller.

The shell 11 is made from sheet metal,which is drawn or pressedaccurately to the desired.

acids and corrosive liquids and gases; also, instead of a seamless shellthe latter may be made of a sheet or plate shaped and joined at itsedges by a longitudinal seam.

In carrying out my invention the required number of frame-heads aremounted. accurately on the shaft and rigidly secured thereto. Then theshell,which has previously been drawn or pressed to shape, is sprunginto position on the frame-heads and is there secured by brazing or inany secure and suitable manner. The impeller is immediately ready foruse in the pump or blower without the customary expensive machine-work.As the shell can be produced very rapidly from a minimum weight of metaland the frameheads are likewise quickly and inexpensively produced, itis obvious that by means of my invention I can effect a great saving oflabor, time, material, and consequently of money, in the production ofimpellers, and can produce a much lighter article than has beenheretofore produced.

Having thus fully described my invention, what I claim as new, and wishto secure by Letters Patent of the United States, is-

1. An impeller for a rotary blower comprisinga series of supportingframe-heads mounted on a shaft and for-med of the contour desired forsaid impeller and a thin metallic shell formed of one piece and of likecontour and sprung upon-said frames,whereby a seamless impeller isprovided of light and durable construction, substantially as set forth.

2. An impeller for rotary blowers comprising'a series ofsupporting-frames of the contour desired for the periphery of saidimpeller mounted on a shaft and a metallic shell formed of like contourand of a single plate from end to end of the impeller mounted upon saidframes, whereby an impeller is provided which will not leak and will beof light and durable construction, substantially as set.

forth.

In witness whereof I have hereunto set my hand and seal, at Chicago,Illinois, this 5th day of February, A. D. 1903.

HARRY AROHIBLE WAINWRIGHT. [L. s]

Witnesses:

S. GoooH LErrcH, CHAS. BROWN.

